dunking



.W. B-. DUNNING.

Base Burning Stove fora Steam Heating Boiier.

Patented April 12 1870.

Invenlor if user ffifwa N, PETERS. Piwlo-Uihognphur. Wishingiun. D. c.

steam-drum E by means of pipes 5.

UNITED STATES WILLIAM B. DUNNING, OF GENEVA, NEW YORK.

BASE-BURNING STOVE FOR A STEAM -HEATING BOILER.

Specification forming part of Letters Patent No. [0],?!8. dated April12, 1870.

To aZZ whom it may concern:

Be it known that I, IVM. B. DUNNING, of Geneva, in the county of Ontarioand State of New York, have invented a certain new and usefulSteam-Heating Boiler; and I do hereby declare that the following is afull, clear, and exact description thereof, reference being had to theaccompanying drawings, making part of this specification, in whichFigure 1 is a vertical central section of my invention. Fig. 2 is a planview below the dotted line av, Fig. 1. Fig. 3 is a plan view of thefire-grate, and Fig. 4 is a section of a portion of the same. Fig. 5 isa vertical section of a modification of my invention.

My invention relates to an apparatus for heatingbuildings; anditconsists, chiefly, in a certain arrangement of a fuel-reservoir withinan annular tubular generator.

In the ordinary steam-heating boilers it is necessary to frequentlyreplenish the fuel upon the fire, which operation generally causes thesteam to run down, or by the neglect to do it at the proper time steamceases to be generated. The rents in all the radiators must then beopened to allow the steam as it is again raised to enter and drive outthe air-a troublesome process, especially in large buildings. To obviatethese difficulties, Iprovide a steam-generator with a fuel-reservoirsimilar in its action to those in common use in coal stoves.

The reservoir B, Fig. 1, is located centrally within the annularwater-chamber A, resting upon the upper edge of the latter by means ofsuitable lugs, and extending down into the furnace to a proper pointabove the grate G.

The water-chamber A is provided with vertical fire-tubes a, throughwhich the flame and gases descend into the annular smoke-chamber D,Figs. 1 and 2, formed by surrounding the shell of the boiler with asuitable protecting wall or jacket.

The chamber A communicates with the The drum E is located far enoughabove the top of the reservoir B to allow easy access to the latter forreplenishing the fuel through the door and chute F, and the space thusinclosed within the arch-walls forms a combustionchamber for the smokeand gases on their way to the chimney. The steam-pipe f and return=water pipe f are attached to the steam-drum in the usual manner,together with safety-valve and other necessary appliances. It is.advisable to connect the pipes I) to the drum somewhat above the bottomof the latter, as shown in Fig. 1, whereby the bottom plate is keptconstantly covered with the water of conden= sation returning throughthe pipe f and consequently prevented from being burned by 7 heat fromthe furnace. The flame and gases take the course indicated by the arrowsin Fig. 1, passing between the reservoir and in= terior of the shell A,returning through the flues a, and ascending upon the outside of theshell A to the escape d.

It will be observed that by the above-described arrangement ofheating-surfaces I expose both the inner and outer periphery of theshell A to the action of the heat, as well as the lower side of the drumE and the inner surface of the flues a, thus economizing the heat to thegreatest extent.

The fuel-reservoir B is covered by the slide 9, which is drawn out intothe doorway F when the former is being filled. Those of the fines towhich are opposite the door F are covered by the slide when thus drawnout, and the heat prevented from rising therefrom and the fuel fromfalling through into the chamber D.

The lower portion of the reservoir B is made detachable, for the purposeof renewing it when burned out.

In Fig. 4 I have shown another form of heater, differing, however, butslightly from that shown in Fig. 1, in which the flame passes directlythrough the flues a and returnsthrough the chamber 1) to the pipe (2.The heat is not so fully economized as in the first-describedarrangement; but it may be preferable in many locations on account ofrequiring a less powerful draft.

The advantages of my invention are, that the heat is very nearly allutilized by passing over the extended surfaces of the generator. Steamis kept up constantly by filling the fuelreservoir at proper intervals,each operation occasioning no fluctuation in the steam-supply. All theparts of the apparatus are simple in construction and properly protectedfrom destruction by heat.

It may be desirable to hinge each bar of the with reference to thefuel-reservoir B and augrate G separately. nular water-chamber A, andconnected to the- WVhat I claim as my invention, and desire latter bypipes b, as and for the purposes set to secure by Letters Patent,isforth.

1. The smoke-chamber D and annular Water- I 7 T chamber A, with orwithout the vertical flues v DUNNIL a, in combination with thecentrally-located \Vitnesses: fuel-reservoir B, for the purposes setforth. 7 S. SOUTI-IWORTH,

2. The arrangement of the steam-drum E CHAS. H. RUs'I.

